The term common trust fund as used in section 3(a)(2) of the Act (15 U.S.C. 77c(a)(2) ) shall include a common trust fund which is maintained by a bank which is a member of an affiliated group, as defined in section 1504(a) of the Internal Revenue Code of 1954 (26 U.S.C. 1504(a) ), and which is maintained exclusively for the collective investment and reinvestment of monies contributed thereto by one or more bank members of such affiliated group in the capacity of trustee, executor, administrator, or guardian, Provided That:
17 C.F.R. §230.132
15 U.S.C. 77s(a)